/Engine/Source/Editor/AnimGraph/Public/AnimGraphNode_Base.h
Some anim graph nodes can act as proxies to outer nodes (e.g. sink nodes in nested graphs). Returning that outer node here allows attribute visualization to be forwarded to the inner node from the outer.
the proxy for attribute display
virtual const [UAnimGraphNode_Base](API\Editor\AnimGraph\UAnimGraphNode_Base) * GetProxyNodeForAttributes() const